An “atoll cloud” forming over an island due to heating of the land during the daytime would be which type? （）

An “ABC” dry chemical fire extinguisher would be LEAST effective against a fire in（）.

A.a mattress
B.spilled liquids such as oil or paint
C.high voltage electrical gear
D.a trash can

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AMVER is a system which provides（）.

A.satellite communications
B.navigational information
C.weather information
D.position reporting service

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